Sample Answer:
The column graph summarises the percentages of elderly US citizens who were above 64 years old between 1900 and 2000 based on the U.S. Census Bureau's decennial census of population. Generally speaking, the ratio of senior citizens in the USA increased significantly over the period and 65 to 74 years old age group were highest in percentage in terms of their ratio among the elderly Americans.

According to the graph, four out of hundred Americans were above 64 years old in 1900 and the majority of them were between 65 to 74 years old at that time. The ratio of people over 85 years old in this decade was very insignificant. After three decades, the aged people’s ratio in the US reached to over 5% and it kept on increasing until the end of the 20th century. Almost one in ten US citizens were elder in 1970 and 0.7% of them were 85 years old. The growth of senior citizens accelerated after 1980 in the USA. At the last two decades of the 20th century, the USA had been the home to 12% senior citizens and almost 4.5% of them were between 75 to 84 years old and 1.5% above 85 years old.